PlatformNotSupportedException Loading .NET 2.0 in .NET 4.0 Process

Question

I'm attempting to load a .NET 2.0 assembly into a C# .NET 4.0 PowerShell module. If I attempt to reference the assembly, I get a PlatformNotSupported message indicating the 2.0 assembly doesn't support .NET 4. I'm also loading the 2.0 assembly via reflection.

I tried creating an net40AssemblyName.dll.config with the below configuration, but that doesn't work either.

<?xml version="1.0" encoding="utf-8" ?> 
    <configuration> 
        <startup useLegacyV2RuntimeActivationPolicy="true"> 
             <supportedRuntime version="v4.0" />    
        </startup>
    </configuration>
 </xml>

I'm unsure if this is due to the dll.config not working, or if this would have to be applied at the PowerShell.exe.config level.

Answer 1

I ended up separating out the specific cmdlet that targeted one platform vs. another into separate projects. I was then able to package both projects into a single MSI and provide an option during installation about which platform to target.